"Yes they will work on your echo 1 master series w/ extra lower receiver, I know bcuz I got one for christmas bought these mags as well. I used them today they worked perfectly no feeding issues no jams a few left over bbs after you eject the clip fall out but other than that they were absolutely perfect.

by John C. on 05/24/2008

"I got these for my TSD/Galaxy MP5-PDW. They fit nice. They are plastic, but built pretty sturdy. I've run at least 2000 rounds through each of the eight in the pack with not a single problem. They feed perfectly every time. I gave each of them a small shot of silicon oil to help them run smoother; but it really wasn't necessary as they already fed perfectly. Also, they actually hold 100 rounds each. Definitely a good alternative to the more expensive mags.....And no winding like the high-caps.

by Stephan P. on 02/19/2012

"These mags are great good price.
Pros
Feed amazingly after you break them in and lube them up with silicone
Good price if you are on a budget
Cons
They tend to wobble alot in my JG mod5 a4 Ras so put some tape on them to stop this from happening

by Chris R. on 10/16/2008

"Will these work with a JG Matrix mp5a4?
Thank you if you answer my question

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